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%% 
%%  The LaTeX Graphics Companion, 2ed (first printing May 2007)
%% 
%%  Example 6-2-14 on page 341.
%% 
%%  Copyright (C) 2007 Michel Goossens, Frank Mittelbach, Denis Roegel, Sebastian Rahtz, Herbert Vo\ss 
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 

\documentclass{ttctexa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{159.83385pt}
\StartShownPreambleCommands
\usepackage{pstricks,pst-node}
\StopShownPreambleCommands
\begin{document}
\begin{pspicture}[showgrid=true](3,3)
  \rput[bl](0,0){\rnode{A}{Idea 1}}
  \rput[tr](3,3){\rnode{B}{Idea 2}}
  \ncline[nodesep=3pt,doubleline=true]{<->}{A}{B}
  \rput[lt](0,3){\rnode{A}{Idea 3}}
  \rput[rb](3,0){\rnode{B}{Idea 4}}
  \ncline*[nodesep=3pt,doubleline=true]{<->}{A}{B}
\end{pspicture}
\end{document}